Relay.



S. ELWITT.

RELAY.

APPLICATION FILED OCT. 7.1912.

1,144,745. I PatentedJune,29,1915.

WITNESSES UNITED STATES PATENT onnron.

SAMUEL E. WITT, OF CHICAGO, ILLINOIS, ASSIGNOR TO AUTOMATIC ELECTRICCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

RELAY.

Specification of Letters Patent.

Patented June 29, 1915.

Application filed October 7, 1912. Serial N 0. 724,479.

To all whom it may concern:

Be it known that I, SAMUEL E. VVITT, a citizen of the United States ofAmerica, and resident of'Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in Relays,of which the following is a specification.

My invention relates to improvements in relays, and more particularly toan improved mounting for the relay armature.

An object of my invention is to provide an armature which may be easilyput in place and removed and a mounting which allows free movement ofthe armature without permitting any lost motion. I A further object isto provide a mounting of this character in which the armature is mountedupon a knife-edge bearing and no pivot screws arcnecessary for holdingthe same in place.

My invention will be more readily understood by reference to theaccompanying drawings, in which Figure l is a side elevation of a relaye bodying the principles of my invention. Fig. 2 is a top end view ofthe same. Fig. 3 is an enlarged view of the armature bearing.

Referring to Fig. l, I have shown a relay comprising the magnet Aadapted to be supported by a heel-piece B which is secured to the magnetby means of a screw at the base of the same. Mounted upon thisheel-piece B and insulated therefrom there is a pair of contact springsC. While I have shown but a single pair of contact springs, it is, ofcourse, obvious that .a plurality of such pairs couldbe mounted on thisheel-piece and operated simultaneously therewith. Likewise mounted on,this heel-piece is a pair of curved flexible pieces of metal D. Thesemembers are mounted on opposite sides of the heel-piece, as clearlyshown in Fig. 2,

and are provided with a pair of notches H.

The armature E for the electromagnet is provided with a pair ofupwardly-inclined end portions E, which end portions are provided withflanges F which engage with the notches H in the members D. The point ofcontact is directly in line with the rear end of the armature E and thefront edge G of the heel-piece B. With this arrangement thearmature isfirmly but lightly held in place, allowing the same to swing or tilt onits fulcrum. As thus mounted the armature operates with a minimum amountof friction and play owing to the fact that a knife-edge bearingprovided at the point where the upper edge G of the heel-piece B engagesthe armature This point being directly in line with the point at whichthe members I) engage the armature, all backward and downward pressureis eliminated, thus allowing the armature perfect freedom. Carried bythe armature E there is an operating arm I provided with an end portionwhich bears against one of the springs C and operates the same in amanner which will be readily understood.

It will thus be seen that I have devised a relay which, when onceassembled, will always remain in perfect adjustment, Without anyparticular attention, on account of not having any pivot screws tobecome loose or bind, or any place where friction will cause impairmentto the free movement of the armature. In order to remove the armaturefrom the relay it is merely necessary to press the flexible arms Doutward beyond the lugs F and the armature can then be readily removed.

While I have illustrated one particular embodiment of my invention, itwill be understood that I do not wish to be limited to the exactconstruction shown and described.

What I claim as my invention is 1. In a relay, an electromagnet, anarmature therefor, a heel-piece secured to said electromagnet, and apair of members carried by said heel-piece, and extending atsubstantially right-angles to said armature, adapted to hold the edge ofsaid armature against said heel-piece.

2. In a relay, an elcetromagnet, an arma ture therefor, a heel-piecesecured to said electromagnet, and a pair of flexible members mounted onsaid heel-piece, and extending at substantially right-angles to saidarmature, adapted to hold the edge of said armature against saidheel-piece.

3. In a relay, an electromagnet, an armature therefor having rearwardextensions on i for, a heel-piece secured to said magnet, and

a plurality of curved metallic flexible members mounted upon saidheel-piece and holding said armature against said heel-piece.

6. In a relay, an electromagnet, an-armature therefor, a heel-piecesecured to said electromagnet having a portion'extending substantiallyparallel therewith, and a pair adapted to hold said armature againstsaid heel-piece, said members engaging said heelpieee in substantialalinement with the upper edge of said armature and the upper for- Wardedge of said heel-piece.

7. In a relay, an electromagnet, an arms,

ture therefor, a-heel-piece secured-t0 said electi-omagnet and having aportion extending substantially parallel thereto, apair of flexiblemembers mounted uponsaid heelpiece, and a pair of extensions on saidarmature engaging with said flexible members and adapted to hold saidarmature against heel-piece in substantial alinement with the rear edgeof said armature and .the' upper forward edge-of said heel-piece. ofmembers carried by said heel-piece and Signed by me at Lincoln-Lancaster county, Nebraska, this'24cth day of September,1912.

SAMUEL E. WITT. Witnesses:

SELMER G. OFTEDAHL,

'WALTER J. F'Ums.

25 'said heel-piece, said members engaging said

